// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#define _CRT_SECURE_NO_WARNINGS 1
#include "src/startup-data-util.h"

#include <stdlib.h>
#include <string.h>

#include "src/base/logging.h"
#include "src/base/platform/platform.h"


namespace v8 {
namespace internal {

#ifdef V8_USE_EXTERNAL_STARTUP_DATA

namespace {

v8::StartupData g_natives;
v8::StartupData g_snapshot;


void ClearStartupData(v8::StartupData* data) {
  data->data = nullptr;
  data->raw_size = 0;
}


void DeleteStartupData(v8::StartupData* data) {
  delete[] data->data;
  ClearStartupData(data);
}


void FreeStartupData() {
  DeleteStartupData(&g_natives);
  DeleteStartupData(&g_snapshot);
}


void Load(const char* blob_file, v8::StartupData* startup_data,
          void (*setter_fn)(v8::StartupData*)) {
  ClearStartupData(startup_data);

  if (!blob_file) return;

  FILE* file = fopen(blob_file, "rb");
  if (!file) return;

  fseek(file, 0, SEEK_END);
  startup_data->raw_size = static_cast<int>(ftell(file));
  rewind(file);

  startup_data->data = new char[startup_data->raw_size];
  int read_size = static_cast<int>(fread(const_cast<char*>(startup_data->data),
                                         1, startup_data->raw_size, file));
  fclose(file);

  if (startup_data->raw_size == read_size) (*setter_fn)(startup_data);
}


void LoadFromFiles(const char* natives_blob, const char* snapshot_blob) {
  Load(natives_blob, &g_natives, v8::V8::SetNativesDataBlob);
  Load(snapshot_blob, &g_snapshot, v8::V8::SetSnapshotDataBlob);

  atexit(&FreeStartupData);
}


char* RelativePath(char** buffer, const char* exec_path, const char* name) {
//   DCHECK(exec_path);
//   int path_separator = static_cast<int>(strlen(exec_path)) - 1;
//   while (path_separator >= 0 &&
//          !base::OS::isDirectorySeparator(exec_path[path_separator])) {
//     path_separator--;
//   }
//   if (path_separator >= 0) {
//     int name_length = static_cast<int>(strlen(name));
//     *buffer =
//         reinterpret_cast<char*>(calloc(path_separator + name_length + 2, 1));
//     *buffer[0] = '\0';
//     strncat(*buffer, exec_path, path_separator + 1);
//     strncat(*buffer, name, name_length);
//   } else {
//     *buffer = strdup(name);
//   }
//   return *buffer;
  DebugBreak();
  return nullptr;
}

}  // namespace
#endif  // V8_USE_EXTERNAL_STARTUP_DATA


void InitializeExternalStartupData(const char* directory_path) {
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
  char* natives;
  char* snapshot;
  LoadFromFiles(RelativePath(&natives, directory_path, "natives_blob.bin"),
                RelativePath(&snapshot, directory_path, "snapshot_blob.bin"));
  free(natives);
  free(snapshot);
#endif  // V8_USE_EXTERNAL_STARTUP_DATA
}


void InitializeExternalStartupData(const char* natives_blob,
                                   const char* snapshot_blob) {
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
  LoadFromFiles(natives_blob, snapshot_blob);
#endif  // V8_USE_EXTERNAL_STARTUP_DATA
}

}  // namespace internal
}  // namespace v8
